Applying a pool shock treatment to a swimming pool, a process also known as “shocking a pool,” ensures that chloramines, waste products and other contaminants that have built up in the pool are oxidized and removed. Pool shock is used in all pools whether they use chlorine, bromine or ozone as the primary sanitization method.

There are five distinct types of pool shock on the market. Your choice comes down to your preferred method of application, budget and whether you have delicate pool finishes and surfaces that could become bleached or damaged. The five types of pool shock are as follows:

1) Potassium Monopersulfate – This is a non-chlorine shock treatment. It is sometimes referred to as “safety shock” as it does not raise chlorine levels to dangerous levels and pool bathers can use the pool quickly after treatment. It is safe to use on all types of pool, including those with vinyl liners and is also commonly used as a spa shock treatment.

2) Sodiun Dichlor – This is normally available in soluble granular form. It does not interfere with the pH balance of the pool or require pre-dissolving. But it does contain cyanuric acid a chlorine stabilizer so take care to ensure that this does not build up to unsafe levels over time.

3) Lithium Hypochlorite shock – This is another chlorine based shock and is similar to Dichlor. It is not stabilised so there is little danger of cyanuric acid build up.

4) Soidium Hypochlorite – Also a chlorine based shock that is normally sold in liquid form. It is fast acting, quick to add to the pool and does not require any advanced preparation.

5) Calcium Hypochlorite – This is the most commonly used chlorine shock treatment and is available in a variety of strength levels. Products with over 70% of available chlorine are sometimes referred to as “super shock.” Pre-dissolving is needed and the product may not be suitable for all pool surfaces.